Prolonged Use of Common Heartburn Drugs Linked to Nutrient Deficiencies, Study Finds
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A new study warns that long-term reliance on proton pump inhibitors (PPIs) – a widely used class of medications for gastric disorders – can significantly impair the body’s ability to absorb essential nutrients, potentially leading to serious health consequences.
Researchers from the Federal University of São Paulo (Unifesp) and the Faculdade de Medicina do ABC (FMABC) have uncovered evidence suggesting that prolonged use of drugs like omeprazole, pantoprazole, and esomeprazole disrupts mineral distribution throughout the body, increasing the risk of anemia and osteoporosis. The findings, published in ACS Omega, underscore the importance of cautious and medically supervised use of these medications.
PPIs and Nutrient Absorption: A Delicate Balance
Proton pump inhibitors work by suppressing the production of stomach acid, providing relief from conditions like ulcers, gastritis, and acid reflux. While effective in managing these ailments, this reduction in acidity can hinder the absorption of vital nutrients that rely on an acidic environment for proper uptake. The research team, supported by Fapesf, investigated the specific effects of continuous PPI use on the absorption of iron, calcium, zinc, magnesium, copper, and potassium in a controlled study using rats.
The animal study revealed significant alterations in nutrient distribution. Researchers observed an accumulation of minerals in the stomach alongside imbalances in the spleen and liver. Critically, blood tests showed an increase in calcium levels – potentially indicating calcium being leached from bones – and a decrease in iron, raising concerns about the development of anemia and osteoporosis. Furthermore, the study detected notable changes in immune system cells, suggesting a broader impact on overall health.
Simulating Human Use: A Multi-Stage Study
To mimic real-world scenarios, the researchers divided adult rats into control and treatment groups, administering omeprazole over periods of 10, 30, and 60 days. These durations were chosen to reflect varying lengths of prolonged medication use commonly observed in human patients.
“The most worrying finding was the significant increase in calcium in the animals’ bloodstream, which may indicate an imbalance with the removal of the mineral from the bones and future risk of osteoporosis,” stated a lead researcher from Unifesp who coordinated the study in partnership with Fernando Fonseca, from FMABC. “However, longer studies are needed to confirm this hypothesis.”
Beyond Omeprazole: Implications for Newer PPIs
While the investigation focused on omeprazole, researchers emphasize that newer PPIs – such as pantoprazole and esomeprazole – operate through the same mechanism. In fact, they suggest these newer drugs may even have a more pronounced effect. “In these cases, the effect can be even more intense, as these molecules have a more powerful and longer-lasting action,” one researcher explained. “Some take more than five days to allow the formation of new proton pumps, while omeprazole takes around one to three days, which can intensify the side effects.”
The impacts of PPIs on nutrient absorption are not entirely new knowledge, but this study expands the understanding by specifically including magnesium and zinc in the analysis. Researchers reinforce the importance of rational medication use and suggest that supplementation may be necessary in some cases, always under medical supervision.
Concerns Over Increasing Accessibility
The potential for widespread overuse is growing. A recent ordinance from the National Health Surveillance Agency (Anvisa) is set to authorize the over-the-counter sale of omeprazole 20 mg in November 2025. A researcher at Unifesp cautioned that this increased accessibility could encourage self-medication and prolonged, unsupervised use, disregarding the recommended 14-day treatment limit.
However, Anvisa defends the decision, stating that it represents “an advance in rationalizing its use and promoting safe and responsible use.” The agency emphasizes that limiting treatment to 14 days reinforces the message that the medication is intended for mild, temporary symptoms and encourages patients to seek medical evaluation for persistent issues. Anvisa also clarified that packages exceeding a 14-day supply will still require a prescription.
A Call for Prudent Use and Medical Monitoring
“This is not about demonizing the medicine, which is effective for several gastric conditions,” a researcher emphasized. “The problem is its trivialized use, including for mild symptoms such as heartburn, and for prolonged periods of months and even years. Its adverse effects should not be neglected.”
The study underscores the need for a more informed approach to PPI use, emphasizing the importance of medical monitoring and individualized assessment to determine the appropriate course of treatment and address potential nutrient deficiencies. Researchers suggest that a comprehensive evaluation of each case is necessary to weigh the benefits against the potential risks.
